Tom --- generally a guy who has it all together because approaches every situation like a game of chess -- was strangely confused. He sat at the curl machine his best WTF face on. As she began kneading her young puss through her thong, he looked at me and mouthed, "Does she know we can see her?" I put a finger to my lips. Just in case she couldn't and somehow forgot we were there, I didn't want to disturb the ignorance that was giving all three us bliss. Maybe she was invisible with her eyes closed. Tom wasn't curling any more, and I stood at the sides of the treadmill -- our workouts clearly over for the night.
Being so late, I was pretty sure none of the other residents would catch what was going on. I *did* fear Laura would come out of the sauna before her sister was finished the display she was giving Tom and I. We had long since stopped what we were doing. We were now happy victims. Tom and I just happened to reap the benefits of being there. Had she come in at that time, we would have just been two men in our late thirties gawking at her sister. Her sister who, in the porn world, would have been considered 'barely-legal'. Fortunately, that didn't happen. Both of us knew we were going to go home to our respective ladies with heighten passion. The only negative I could see would be trying to explain where it came from.
Becky continued her brazen, live, one-woman show for herself as the audience. She quickly tired of her thong acting as a buffer to her pleasure. This was the first time she had stopped spreading her legs for her reflection's enjoyment. She brought her legs together and stood up. Her thong dropped to a ball below her and she picked up were she had left off. She began with just her middle finger between her lips. Her thumb worked circles around her clit. With each climb of pleasure, came another finger. Her other hand snaked its way under tank after tank. The way she dug revealed a matching tiger-print bra. She dug further still to pull and rub the nipple of her petite tit.
At two fingers, she paused to bring them to her lips. A smack of her lips as she sucked her juices from them and she was back the work where she left it. I could tell that she wasn't going to make it pass three fingers. Her breathing was already a wheeze. She began to make the most attractively disgusting face. She matched her expression with agonized breathing as though struggling to keep her orgasm at bay. It overtook her. To this day, you could convince me the whole thing never happened. Especially unbelievable was the way it overtook her... ...and the mirror. Her counterpart got sprayed by all the passion Becky was building up. Tremor after tremor followed until she regained composure. I thought to myself how much I would have loved to be the towel she had grabbed to clean behind herself.
Laura did finally come out of the sauna. She knew it was strange to see the two of us turn to her sharply. We had the dear-in-the-headlights looks of two children who had just been caught doing something. But what? Laura couldn't see anything that looked like incriminating evidence. Tom and I didn't move for fear that she would. No need to rock the boat if we weren't in the wrong. My blood was pumping faster than it had through my entire workout. Neither of us wanted to make eye contact with Laura. As Becky left, she got a big but silent "Thank you," from each of us.